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Jann Horn discovered that eCryptfs improperly attempted to use the mmap()handler of a lower filesystem that did not implement one, causing arecursive page fault to occur. A local unprivileged attacker could use tocause a denial of service (system crash) or possibly execute arbitrary codewith administrative privileges.

Update instructions:

The problem can be corrected by updating your system to the followingpackage versions:

Ubuntu 16.04 LTS: linux-image-4.4.0-1015-snapdragon 4.4.0-1015.18

After a standard system update you need to reboot your computer to makeall the necessary changes.

ATTENTION: Due to an unavoidable ABI change the kernel updates havebeen given a new version number, which requires you to recompile andreinstall all third party kernel modules you might have installed.Unless you manually uninstalled the standard kernel metapackages(e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual,linux-powerpc), a standard system upgrade will automatically performthis as well.